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Tag Archives: energy storage

The last word on the cost of balancing renewables

By Dave Elliott

The UK Energy Research Centre (UKERC) has produced an update to its 2006 report that had looked at the costs and impacts of using ‘intermittent’ electricity from renewables such as wind and solar. The 2006 study had only examined impacts with up to a 20% input, but the UKERC researchers now say that, even at the higher levels we are now expecting, it was still the case that the costs of balancing renewables could be low. However, they warned that, unless ‘urgent’ action was taken by the government to boost grid flexibility, the costs of adding renewables in future will be ‘much higher than they need to be’.

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ICL and UCL on renewable balancing

By Dave Elliott

Several academic studies have indicated that balancing variable renewables need not be expensive. An authoritative review of over 200 studies by UK Energy Research Centre in 2006 concluded: ‘Intermittency costs in Britain are of the order of £5 to £8/MWh, made up of £2 to £3/MWh from short-run balancing costs and £3 to £5/MWh from the cost of maintaining a higher system margin’.  

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UK Industrial Strategy – the energy dimension

By Dave Elliott

The government’s new long-term Industrial Strategy’ green paper is about growth, exports, competition and the development of new technology, to be achieved by upgrading skills and infrastructure, improving supply chains and increasing investment in research and innovation – with £4.7 bn by 2020-21 in R&D funding. The new Industrial Strategy Challenge Fund could support smart and clean energy technologies, such as storage and demand-response grid technologies. Nuclear also gets a mention – SMRs and even fusion. That’s along with robotics/artificial intelligence, biotech, digital technologies and 5G mobile networks and the like.

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The green power switch – all to solar

By Dave Elliott 

A new book ‘The Switch’ (Profile Books) by Chris Goodall suggests that the combination of cheap solar photovoltaics and cheap batteries will be a global winner. It is certainly true that the cost of PV solar has been falling rapidly, outstripping predictions, and even confounding most of the PV optimists, as the technology has improved and markets for it have built. Goodall sees this as a continuing process, at maybe up to a 40% annual growth rate, with PV soon becoming the dominant energy source globally, a view that he notes even some conservative oil companies now share. Lithium ion battery costs have also fallen significantly. So, with wind also providing inputs when there is no sun, we are all set!  A similar line was taken in Tony Seba’s book ‘Clean Disruption of Energy and Transportation’. PV and batteries are going to boom worldwide, and electric vehicles too.

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Solar PV and energy storage

By Dave Elliott

Some say that the vision of households and businesses moving largely off-grid by storing solar power generated during the day for use overnight is close to becoming a reality. The prospects for moving entirely off grid may be limited – most projects will still need grid links to allow for top-ups when solar input is low for long periods and the stores are exhausted. However, that still leaves a significant potential for self-generation and storage.                                                                                        (more…)

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Storage will cut renewable balancing cost

By Dave Elliott

Energy storage is all the rage at the moment, with a Daily Telegraph columnist even claiming that ‘cutting-edge research into cheap and clean forms of electricity storage is moving so fast that we may never again need to build 20th Century power plants in this country, let alone a nuclear white elephant such as Hinkley Point’.

And it could be cheap. The recent Carbon Trust/Imperial College report on energy storage says that ‘the UK can realise significant cost savings if market arrangements for the electricity system allow for an efficient deployment and use of energy storage, alongside other flexibility options such as demand response and interconnectors’. It claims that many of the changes needed ‘are likely to be cost neutral and require no additional funding from the government’.

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US gets to grips with renewables

By Dave Elliott

The US currently gets about 17% of its electricity from renewables, including hydro, and its potential for rapid expansion is huge. A new study from NOAA, the US National Oceanic and Atmospheric Administration, says that a ‘US transition to a reliable, low-carbon, electrical generation and transmission system can be accomplished with commercially available technology and within 15 years’, according to Alexander MacDonald, one of the lead authors of the report, which was published in Nature Climate Change. But it would need supergrid  ‘electron superhighways’ to transmit electricity across the country.

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PV solar: big isn’t always better

By Dave Elliott

PV solar is now big – with 227GW installed around the world. But large solar farms apart,  much of it is in small roof-top units. Would bigger arrays be better? Certainly economies of scale suggest large-scale projects are generally more cost-effective than small ones. That holds up well for wind, but does it also hold for PV solar?

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Why not nuclear and renewables?

By Dave Elliott

Nuclear plants do not generate carbon dioxide, so why can’t we have nuclear AND renewables, supporting each other, as a response to climate change? In evidence to the Energy and Climate Change Select Committee in July Amber Rudd MP, DECC Secretary of State, suggested that despite its high cost nuclear baseload ‘enables us to support more renewables’ and was needed since, ‘as we all know, until we get storage right, renewables are unreliable’. Can nuclear really support renewables, and is it really low carbon?

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A new UK green energy transmission and storage vector

By Dave Elliott

This helpful paper from a team at Sheffield University, UK, entitled ‘Great Britain’s Energy Vectors and Transmission Level Energy Storage’, suggests that ‘power to gas’ conversion systems could supply synthetic gas (syngas), made using renewable electricity, for storage in the gas pipe network, so as to balance variable renewables, this  being a substantially larger storage option for the UK than pumped hydro.

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